The 100 physicians included in the study were paid a total of $12,446,969.

Here's what researchers found:

All together, the physicians published 412 articles in 2016.

Of those articles, 225 were relevant to the general payments received by the authors.

Authors only declared conflicts of interest in 84 of the 225 relevant publications.

"A high level of inconsistency was found between self-declared COI and the OPD among the physicians receiving the highest industry payments. Therefore, a policy of full disclosure for all publications, regardless of relevance, is proposed," study authors said.